GRP Tank Lining
Nationwide Water Tank Lining Experts

What is GRP Lining?

WRAS Certified & DWI Listed
20 Years In Business

GRP Lining (also known as glass-reinforced plastic lining or fibreglass lining) amalgamates the robustness of glass with the endurance and pliability of plastic. It is created by forming a mat of glass strands and subsequently enveloping it with a polymer. The outcome is a 2-3mm thick fibreglass sheet which is flexible, lightweight, durable and waterproof. The lining can also be applied to new-builds as well as refurbished structures and is ideal for covering surfaces such as; concrete, brick, metals, wood and already existing fibreglass.

Fibreglass lining is vital in plastic tanks as without full protection, the material can become cracked and air-filled cavities can be present which leaves conditions for bacteria to multiply. Our exceptional GRP tank lining service can prevent this from happening by utilising our ACOTHANE DW coating system.

ACOTHANE DW coating provides protection from chemical attacks and resist the growth of bacteria such as micro aquatic organisms and black spore fungi. Alongside resistance and protection, our polyurethane coating will be much easier to clean and maintain, so you can witness long-life performance with very little maintenance.

What are the benefits of fibreglass linings?

  • Low maintenance - Fibreglass linings require minimal upkeep, typically requiring a through clean once in a while.
  • Easy to repair - While damage is infrequent, repairing a GRP lining is usually a straightforward and hassle-free process.
  • Corrosion and chemical resistant - fibreglass linings exhibit resistance to corrosion and many chemicals and can also withstand UV degradation.
  • Impact resistant - GRP offers a high level of impact resistance. Manufacturers can tailor the product's strength and flexibility to meet particular specifications by adjusting the glass-to-plastic ratio.
  • Long lifespan - Our fibreglass linings come with a 25-year warranty, and their longevity often exceeds this timeframe.

If you would like to find out further information about our GRP lining, contact us now or request a quote today.

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GRP Coating

Many people believe the best solution for fixing/maintaining GRP water tanks is by fitting a new tank entirely however, here at COVAC, we strongly advise opting for a tank relining or coating service as this will prevent expensive and unnecessary costs. Our water tank experts, who have a wide array of great experience in repairing GRP tanks, have all the knowledge of a relining service and will provide you with the exact solution you need. We also offer a GRP coating service which is a cost-effective method of maintaining your GRP water tanks.

Whether your tank is severely damaged or just in need of a reline, we have rarely come across a water-retaining structure that we have not been able to repair. Problems with your water tank can arise even with regular cleaning if your current lining is not providing the sufficient protection from bacteria.

Thankfully, our GRP coating service can help to retain aesthetics of your tank and will protect it from the general exposure to the natural outdoor environment.


How much does GRP Lining cost?

The price can vary and is largely dependant on the nature of the work environment, the level of preparation work needed and the thickness of the GRP lining. Fill out our contact from below to have an accurate price for you GRP tank lining.

How long will the GRP lining last?

The overall life expectancy will depend on the quality of the installation, the type of environment or elements that the lining is exposed to and the level of maintenance and repair work undertaken. As a rough estimation, you can expect your GRP tank to last 10 to 50 years.

Can I use GRP lining instead of full surface or structure replacement?

Many people often believe that when their GRP tank is in need of some maintenance, that a full on replacement is required. More often than not, you can fix your issues with a tank lining service. There comes a number of benefits this way too such as it being considerably cheaper, as well as reducing the need for downtime of your tank.

How difficult is it to install?

On the whole, It is fairly difficult to install GRP tanks due to their being a number of factors that can cause the quality of the glass fibre laminate to be badly installed. Installers should carefully follow the manufacturer’s instructions or equally, you should contact a trained specialist who has had many experiences with the installation process before.

Are there any online guides that show GRP lining problems and solutions?

Yes, our YouTube video above discusses all you need to know about possible problems and solutions.

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For more information or help and advice, please don’t hesitate to get in touch by filling out the form below or calling us. A member of our friendly and experienced team will be happy to help you.


  • Cert No. 22946

  • Cert No. 22946